Requirements - Segger J-Link User Manual

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When Read and Write Pointers point to the same element, the buffer is empty. This
assures there is never a race condition. The image shows the simplified structure in
the target.

13.2.4 Requirements

SEGGER RTT does not need any additional pin or hardware, despite a J-Link con-
nected via the standard debug port to the target. It does not require any configura-
tion of the target or in the debugging environment and can even be used with varying
target speeds.
RTT can be used in parallel to a running debug session, without intrusion, as well as
without any IDE or debugger at all.
J-Link / J-Trace (UM08001)
CHAPTER 13
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RTT